Concept:A primary source is firsthand information, while a publication is generally not original data.
Explanation:Primary sources provide direct, original evidence without interpretation.
Questionnaire, observation, and interview are all tools for collecting firsthand data directly from respondents or events.
A publication, however, is a medium that may combine, edit, or repackage information — usually making it a secondary source.
Therefore, publication is the exception among the given options.
Answer:B. publication